Quote:
Originally Posted by WRX06TR
So I was wondering, since my job requires me to drive around a bit and stop and restart the car frequently, would forged pistons be a bad idea. I read that forged pistons need to hit operating temp before driven, something I don't always have the ability to do.
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Forged pistons are just a little "looser" than the cast ones, simply because they expand more once they heat up, so they are just a little smaller when cold. All you need to do is stay out of the boost until the oil temps are up... which you
should be doing anyway even if you don't have forged pistons.
Ultimately, the only difference is that the motor may be a little noisier when cold with the forged pistons. It's not really a ton different.
Also, if you have to start and stop the car a lot... if the restart is within an hour of the stop, it's not really another cold start. It takes quite some time for an engine to get back down to ambient temps after turning them off.